All the differences in these motors is gona make me pull my hair out lol. thats to bad cause i aint got much left.
from racing rc
from ajonr
The crank throw is +/- 26.50 mm or 1.043 in. Small or large case.Didn't matter.
this dont make sense to me.
Are you using the gasket when you put your cylinders on ajonr? When i took mine out and installed my old cylinder on my new crank housing it also hit the piston into the head. I had to have a min of a .010 gasket in it to keep it from hitting. when I put my new cylinder on the same engine I didnt need a gasket at all and it would not hit.
If there is no difference in the rod lenght of the small case engine and the large case engine and the stroke is the same on the large and small case engine then the cylinder base has to be cut the same height from the centerline of the crank. meaning the cylinder base mounting surface to cranks center is the same on all the engines no matter large or small case.
I have to agree with the power output ajonr. I think we are getting pretty close as i think we are exploring areas that i have never seen talked about anywhere till now.
I have no way to know what hte thrust output is and i just dont want to take the time to build a way to do this yet. No i havent tried a velocity stack and to be honest i really cant belive this will do much good. any increase would be very small at best. I could be dead wrong though.
I've noticed on many of my carbs, that the screw that holds the throttle butterfly to the shaft, the threaded end sticks way out into the venturi. I would think this might restrict some air flow. When I do my conv. I plan on grinding it back flush.
I am certian this would restrict flow. anything placed in the path of the air/gas flow would be a restriction. Again do i think this is going to yeild a noticable gain in power? Probably not but it very well may be worth a try.
Ok so on to something new. I am convinced the way to go from here is trying to reduce the crankcase volume. I had a backplate that is junk as the carb holes are stripped so i decided its a good experimental piece. this is what I came up with. I think this does a good job of reducing the crank case volume and yet does not require a great amount of machinery to do. most anyone can do this. I will describe this mod in future posts in great detail with pics and all but you will just have to be patient for now. anyhow here are the pics of it. this unit is not the one im gona use but just a test to help me develop my method of this mod
